sysdeps/generic/_strerror.c

   1 /* Copyright (C) 1991, 1993, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21
  22 #ifndef HAVE_GNU_LD
  23 #define _sys_errlist sys_errlist
  24 #define _sys_nerr sys_nerr
  25 #endif
  26
  27 /* Return a string describing the errno code in ERRNUM.  */
  28 char *
  29 _strerror_internal (errnum, buf, buflen)
  30      int errnum;
  31      char *buf;
  32      size_t buflen;
  33 {
  34   extern const char *const _sys_errlist[];
  35   extern const int _sys_nerr;
  36
  37   if (errnum < 0 || errnum > _sys_nerr)
  38     {
  39       int len = __snprintf (buf, buflen, _("Unknown error %d"), errnum);
  40       if (len < 0)
  41         return NULL;
  42       buf[len - 1] = '\0';
  43       return buf;
  44     }
  45
  46   return (char *) _(_sys_errlist[errnum]);
  47 }